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In Reply to: RE: Ella - right tube fiery orange glow posted by mikey115 on June 28, 2009 at 06:51:01
Could be that the coupling cap went bad and passed thru some DC to power tubes (KT88 etc). Very easy to dignose. Be careful V is high. With no input, measure DC on the power tube side of the respective cap. Place the black probe in the 0 of the speaker output at the back, use only one hand, dont touch anywhere else and with the red probe of voltmeter check the cap. If you cant figure out which side of the cap, check both, one side should not show any DC volt.
Hope this helps.
thanks very much rasim for the suggestion. i hope to test the amp out this weekend. i will be very careful. i try wherever possible to use alligator clips. thanks again - any other tips from you, brian d. or anyone else will be appreciated.
mike
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I think your version is something like this one. If so, I tried to show you where to check for faulty coupling cap.
Also pay attention to Brians comments if you have automatic bias control
Regards,
Rasim
Hi Rasim,
Yes its the same version. Last weekend turned out to be a working one so I couldnt check out the amp. Hopefully this weekend if all goes well.
Thanks very much again Rasim for the help. I will post my findings.
Cheers
Mike
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